Most privacy activists are already taking an absolutist stance.

Reality is, for normal people there's no point where worrying about spooks and taking actions to protect themselves is reasonable. As you say, there's nothing one can do against a targeted attack. But same is true for broad, untargeted sweeps - if they really care, they will find you anyway, and attempting to reduce your data exposure just flags you as an anomaly, making you more interesting, not less.

The whole "privacy vs spooks" threat analysis is not relevant to regular people.